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CHRLES B. BRISTOL, OF NEW HAVEN, CONNECTICUT.

Letters Patent 1Y0. 67,020, dated July 23, 1867.

IMPRVED SNAP-HOOK.

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TO ALL WHOMIT M AY CONCERN; y

Beit known that I, CHARLES B. BRISTOL, ofthe city and county ot' New-Haven, in the State of Connecticut, have invented a newand uset'ul Improvement in Snap-Hooks for Harness, Ste.; and I do hereby declare thatthe following is a. full, clear, and exact description of the construction, character` and operation of the same, reference being lhad to the accompanying drawings, which make part of this specification, in whichi Figure 1 is a. perspective view of the snap-hook complete, as seen from the under or back side, showing the bridge across the open space, and the spiral or helical spring in its place.

.Figure 2 is a section of the same, cut longitudinally through the centre, showing the bridge, with its projection or stud, the projection or stud on'the tongue part, and the spiral spring as resting on or around those two studs.

Figure 3 isa perspective view of the hook and loop parts, (with one of the ears or lips broken away,) showing the bridge with its projecting stud, and one hole for the i'ulc-rum-pin.

Figure 4 is` a, perspective view of the tongue part, showing the projecting stud and the hole for the fulcrum-pin. i

Figure 5 is a perspective view of the spiral or helical spring. v

My improven'ient consists in making in the portion at the junction of the hook and loop an opcn space between the ears or lips, to prevent its collecting and retaining dirt or ice, and a bridge across it to support a projecting stud, on or around which the lower end of thespi'ral or helical springs rests and is heldin place; and

in cast-ing or fitting a projecting stud on the tongue part near the rear end, but forward of the hole, for the fulcrum-pin, which stud is to pass into the upper end of the spiral spring. so as to steady and sustain-it; and iu the use vof the spiral spring, with its two ends pass'ed on to the two projecting studs, to sustain it in its place.

u I make the hook and loop part of malleable cast iron, or any other suitable material, in the usual shape, as 'shown in fig. 3, except that I cast or leavean open space clear through at the ljunction of the hook A and loop B,between the two ears or lips, as represented at a,.igs. 1, 2, and 3; across which space, a, I cast or malte a bridge, b, figs. 1*, 2, and '3,-on which bridge I cast or tit a projecting stu l, as represented at c, figs. 2 and 3,

on to which the lower eind of the spiral spring, d, figs. 1,V 2, and 5, passes, as represented in section in fig.,2.

I make the tongue-part-C, figs. 1, 2,and 4. of malleable cast iron, or any other suitable material, substantially in the form or shape shown in fig. 4, with a projecting stud near the rear end, but forward of the hole g, for the `ulcru1n-piu, as represented :it e, figs. 2 and 4, on to and around which the upper end ot' the spiral spring passes, and-by which it is heldin place, as indicated in section at e. fig. 2.

I rnake the spirallor helical spring of brass or any other suitably elastic wire, in the usual way, as represented in iig. 5,"a'nd indicated at d, gs. 1 and 2.

Having made the several pnrts, as before described, I pass one end of the spiral spring. iig. 5, ou to the projecting stud c on the bridge b, as represented in section in 2, and pass the projecting stud e on the tongue part into the upper end of the spiral spring d, as indicated in section in lig. 2, and insert the rivet or fulcrum` pin through the holes in the ears or lips, and the rear end of the tongue part, as at g, figs. 2, 3, and 4, and rivet the Ai`ulcruu1-pin in the usual way, or otherwise, when the whole will be :ts/represented in iig. 1, and all the parte will be arranged in relation to each other as indicated in section in fig. 2.

The principal advantagesliumy improvement consist in that by making or leaving un open space entirely through at thejunction oi` the parts. as represented at a, figs. 1, 2, and 3, the snap-hook will never get filled up or clogged with dirt, ice, or other foreign substances, as often happens when the rear end ,of the tongue part andthe spring are fitted into a comparatively close box, asis the case iu the Ilenshaw and the Jndfl if Blahesley patents, and many others; and in that, -by securing or sustaining the two ends of the spiral spring on oraround projecting studs, (as indicated in section in Iig. 2;) so that when the tongue is pressed down, (to open the snap-hook,) those studs will nearly touch each other, and they will form a steadying support to the spring and cause it` to work in a right line (expanding and contracting longitudinally) so as to avoid all lateral or irregular strain on the spring. 4

What I claim as my invention, and desire to secure by Letters Patent, is

The combination of the hook and loop part (having a bridge, b, and stud, 0,) with the tongue part, (hav-lng a. stud, e,') and the spiral spring tl, when the parts are constructed, arranged, and litted'to operate, substantiaily as herein described and set forth.

I CHAS. B. BRISTOL.

Witnesses:

R. FITZGERALD, L. J. MERCHANT. 

